Advanced Shell/Command Prompt plugin will add 5 new commands/functions to your UBot environment and it will allow you to run Shell command hidden (hode those annoying window popups), write batch commands right inside the UBot (instead of executing batch file) and even retrieve the output that Command Prompt produces (functions).
For more information please visit the plugin page:
P.S.: I forgot to remove "delete permanently" command (deletes all files instead of trashing them) from final build, so I'll just leave it as a part of this plugin.
Added "Wait For Exit" option which allows you to wait for the command to get executed, or just proceed with next UBot command if you don't want to wait for exit.